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首页> 外文期刊>Journal of Materials Research >Effect of P-Si_3N_4 seed crystal on the microstructure and mechanical properties of sintered reaction-bonded silicon nitride
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Effect of P-Si_3N_4 seed crystal on the microstructure and mechanical properties of sintered reaction-bonded silicon nitride

机译：P-Si_3N_4籽晶对烧结反应结合氮化硅组织和力学性能的影响

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摘要

β-Si_3N_4 seed crystal has been synthesized from α-Si_3N_4 powder. Reaction-bonded Si_3N_4/SiC composite has been fabricated with β-Si_3N_4 seed crystals. The nitridation behavior and the changes in mechanical properties resulting from the addition of seed crystals were studied before and after gas pressure sintering. Addition of seeds showed a considerable improvement in the nitridation, resulting in increase in fracture strength of the composite. Highly nitrided reaction-bonded Si_3N_4 (RBSN) as a result of the addition of seed crystals gave rise to high strength of composite after postsintering. Fracture toughness of the seeded Si_3N_4 was also improved up to 35 compared to the baseline Si_3N_4. Micrographs showed that the seeded Si_3N_4 developed a bimodal microstructure which resulted in an improvement in fracture toughness.
机译：由α-Si_3N_4粉末合成了β-Si_3N_4晶种。用β-Si_3N_4籽晶制备了反应结合的Si_3N_4 / SiC复合材料。研究了气体烧结前后的氮化行为和由于添加了种晶而引起的机械性能的变化。种子的添加显示出氮化作用的显着改善，导致复合材料的断裂强度增加。由于添加了晶种而导致高度氮化的反应键合Si_3N_4（RBSN）导致了后烧结后复合材料的高强度。与基线Si_3N_4相比，种子Si_3N_4的断裂韧性也提高到35。显微照片显示，晶种Si_3N_4形成了双峰微观结构，导致断裂韧性提高。

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